Mercurial > vim
view src/iscygpty.c @ 34627:5071d4c3ff2e v9.1.0202
patch 9.1.0202: leaking memory in add_user() on failure
Commit: https://github.com/vim/vim/commit/7a2f217988afa1c35b9c093a9d3477198ea250b9
Author: Christian Brabandt <cb@256bit.org>
Date: Sun Mar 24 09:50:03 2024 +0100
patch 9.1.0202: leaking memory in add_user() on failure
Problem: leaking memory in add_user() (LuMingYinDetect)
Solution: free user_copy pointer instead of the user ptr
add_user() is called with a user pointer and the user pointer comes
from these functions:
- return value from the getpwent() function (Unix).
- return value from the getpwnam() function (Unix).
- return value from the NetUserEnum() function (MS Windows).
For the first 2 callers, the man page for those functions directly says,
one should not free the returned pointer (since it comes from static
memory).
For the third caller (on MS Windows), the returned buffer is already
freed directly after calling the add_user() function in
NetApiBufferFree(), so this would lead to a double free().
This all indicates, the user ptr is wrongly freed in the add_user()
function and the intention was to free the user_copy pointer instead in
case of an error.
So let's just use that now.
fixes: #14250
closes: #14260
Signed-off-by: Christian Brabandt <cb@256bit.org>
author | Christian Brabandt <cb@256bit.org> |
---|---|
date | Sun, 24 Mar 2024 10:00:09 +0100 |
parents | 1ffdcd8a424e |
children |
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/* * iscygpty.c -- part of ptycheck * https://github.com/k-takata/ptycheck * * Copyright (c) 2015-2023 K.Takata * * You can redistribute it and/or modify it under the terms of either * the MIT license (as described below) or the Vim license. * * Permission is hereby granted, free of charge, to any person obtaining * a copy of this software and associated documentation files (the * "Software"), to deal in the Software without restriction, including * without limitation the rights to use, copy, modify, merge, publish, * distribute, sublicense, and/or sell copies of the Software, and to * permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * The above copyright notice and this permission notice shall be * included in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ #ifdef _WIN32 #include <ctype.h> #include <io.h> #include <wchar.h> #include <windows.h> #ifdef USE_FILEEXTD // VC 7.1 or earlier doesn't support SAL. # if !defined(_MSC_VER) || (_MSC_VER < 1400) # define __out # define __in # define __in_opt # endif // Win32 FileID API Library: // http://www.microsoft.com/en-us/download/details.aspx?id=22599 // Needed for WinXP. # include <fileextd.h> #else // USE_FILEEXTD // VC 8 or earlier. # if defined(_MSC_VER) && (_MSC_VER < 1500) # ifdef ENABLE_STUB_IMPL # define STUB_IMPL # else # error "Win32 FileID API Library is required for VC2005 or earlier." # endif # endif #endif // USE_FILEEXTD #ifdef __MINGW32__ # define UNUSED __attribute__((unused)) #else # define UNUSED #endif #include "iscygpty.h" //#define USE_DYNFILEID #ifdef USE_DYNFILEID typedef BOOL (WINAPI *pfnGetFileInformationByHandleEx)( HANDLE hFile, FILE_INFO_BY_HANDLE_CLASS FileInformationClass, LPVOID lpFileInformation, DWORD dwBufferSize); static pfnGetFileInformationByHandleEx pGetFileInformationByHandleEx = NULL; # ifndef USE_FILEEXTD static BOOL WINAPI stub_GetFileInformationByHandleEx( HANDLE hFile UNUSED, FILE_INFO_BY_HANDLE_CLASS FileInformationClass UNUSED, LPVOID lpFileInformation UNUSED, DWORD dwBufferSize UNUSED) { return FALSE; } # endif static void setup_fileid_api(void) { if (pGetFileInformationByHandleEx != NULL) { return; } pGetFileInformationByHandleEx = (pfnGetFileInformationByHandleEx) GetProcAddress(GetModuleHandle(TEXT("kernel32.dll")), "GetFileInformationByHandleEx"); if (pGetFileInformationByHandleEx == NULL) { # ifdef USE_FILEEXTD pGetFileInformationByHandleEx = GetFileInformationByHandleEx; # else pGetFileInformationByHandleEx = stub_GetFileInformationByHandleEx; # endif } } #else # define pGetFileInformationByHandleEx GetFileInformationByHandleEx # define setup_fileid_api() #endif #define is_wprefix(s, prefix) \ (wcsncmp((s), (prefix), sizeof(prefix) / sizeof(WCHAR) - 1) == 0) // Check if the fd is a cygwin/msys's pty. int is_cygpty(int fd) { #ifdef STUB_IMPL return 0; #else HANDLE h; const int size = sizeof(FILE_NAME_INFO) + sizeof(WCHAR) * (MAX_PATH - 1); FILE_NAME_INFO *nameinfo; WCHAR *p = NULL; setup_fileid_api(); h = (HANDLE) _get_osfhandle(fd); if (h == INVALID_HANDLE_VALUE) { return 0; } // Cygwin/msys's pty is a pipe. if (GetFileType(h) != FILE_TYPE_PIPE) { return 0; } nameinfo = malloc(size + sizeof(WCHAR)); if (nameinfo == NULL) { return 0; } // Check the name of the pipe: // "\\{cygwin,msys}-XXXXXXXXXXXXXXXX-ptyN-{from,to}-master" if (pGetFileInformationByHandleEx(h, FileNameInfo, nameinfo, size)) { nameinfo->FileName[nameinfo->FileNameLength / sizeof(WCHAR)] = L'\0'; p = nameinfo->FileName; if (is_wprefix(p, L"\\cygwin-")) { // Cygwin p += 8; } else if (is_wprefix(p, L"\\msys-")) { // MSYS and MSYS2 p += 6; } else { p = NULL; } if (p != NULL) { // Skip 16-digit hexadecimal. while (*p && iswascii(*p) && isxdigit(*p)) ++p; if (is_wprefix(p, L"-pty")) { p += 4; } else { p = NULL; } } if (p != NULL) { // Skip pty number. while (*p && iswascii(*p) && isdigit(*p)) ++p; if (is_wprefix(p, L"-from-master")) { //p += 12; } else if (is_wprefix(p, L"-to-master")) { //p += 10; } else { p = NULL; } } } free(nameinfo); return (p != NULL); #endif // STUB_IMPL } // Check if at least one cygwin/msys pty is used. int is_cygpty_used(void) { int fd, ret = 0; for (fd = 0; fd < 3; fd++) { ret |= is_cygpty(fd); } return ret; } #endif // _WIN32 // vim: set ts=4 sw=4: